Pekingese
Just like Chihuahuas, a Pekingese is a small dog breed that completely relies on other methods to seem bigger and scarier when they feel threatened, which can also include biting. It might not take as much to bring out such behaviors.
Pekingese don’t respond well to prodding, poking, or tail pulling. They could be possessive over food, toys, and sometimes, even their primary caregivers. A dog could compete for your undivided attention, and trust me, this dog doesn’t want to lose.
You could even avoid a situation where your child could get hurt by running over to hug you or even trying to play (nicely) with the dog. That’s quite some stress on all of you and a good enough reason to seek out a different breed.